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Republican presidential candidate Ben Carson speaks at a presidential forum sponsored by Heritage Action at the Bon Secours Wellness Arena, Greenville, South Carolina, September 18, 2015 (Credit: AP/Richard Shiro)

Republican presidential candidate Ben Carson speaks at a presidential forum sponsored by Heritage Action at the Bon Secours Wellness Arena, Greenville, South Carolina, September 18, 2015 (Credit: AP/Richard Shiro)